STEVAL-IFS003V1 STMicroelectronics, STEVAL-IFS003V1 Datasheet - Page 18

• Manufacturer Part Number: STEVAL-IFS003V1
• Description: BOARD STLM75/STDS75/ST72F651
• Manufacturer: STMicroelectronics

Specifications of STEVAL-IFS003V1

• Design Resources: STEVAL-IFS003V1 Gerber Files STEVAL-IFS003V1 Schematic STEVAL-IFS003V1 Bill of Materials
• Sensor Type: Temperature
• Sensing Range: -55°C ~ 125°C
• Interface: I²C
• Voltage - Supply: 7.5 V ~ 19 V
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: ST72F651, STDS75, STLM75
• Silicon Manufacturer: ST Micro
• Silicon Core Number: STLM75/STDS75 And ST72F651AR6
• Kit Application Type: Sensing - Temperature
• Application Sub Type: Temperature Sensor
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensitivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-6238

Functional description
3.1.3
Note:
3.1.4
18/39
Temperature register
The temperature register is a two-byte (16-bit) “Read only” register (see
page
complement format, and the contents of this register are updated each time the A/D
conversion is finished.
The user can read data from the temperature register at any time. When a T-to-D conversion
is completed, the new data is loaded into a comparator buffer to evaluate fault conditions
and will update the temperature register if a read cycle is not ongoing. If a READ is ongoing,
the previous temperature will be read. Accessing the STDS75 continuously without waiting
at least one conversion time between communications will prevent the device from updating
the temperature register with a new temperature conversion result. Consequently, the
STDS75 should not be accessed continuously with a wait time of less than t
Depending on the A/D conversion resolution, the 9-, 10-, 11- or 12-bit MSBs of the register
will contain temperature data. All unused bits following the digital temperature will be zero.
The MSB (Bit 15) of the Temperature Register denotes whether the temperature data is
positive or negative. A '0' in Bit 15 is positive and a '1' is negative.
Table 8.
These are comparable formats to the DS75 and LM75.
Overlimit temperature register (T
The T
programmable upper trip-point temperature for the thermal alarm in two’s complement
format (see
0000 0000).
The format of the T
the T
The MSB position contains the sign bit for the digital temperature and bit 14 contains the
temperature MSB.
The resolution setting for the A/D conversion determines how many bits of the T
are used by the thermal alarm. For example, for 9-bit conversions, the trip-point temperature
is defined by the 9 MSBs of the T
Keys:
STDS75
Bytes
Bits
OS
18). Digital temperatures from the ADC are stored in the temperature register in two’s
OS
TMSB = temperature MSB
TLSB = temperature LSB
register are hardwired to zero, so data written to these register bits will be ignored.
register is a two-byte (16-bit) READ/WRITE register that stores the user-
SB = two’s complement sign bit
TD = temperature data
MSB
SB
15
Table 9 on page
Temperature register format
TMSB TD TD TD TD TD TD
14
OS
register is identical to that of the temperature register. The 4 LSBs of
13
MS byte
19). This register defaults to 80 °C at power-up (i.e., 0101 0000
12
THSB
Doc ID 13297 Rev 8
11
OS
register, and all remaining bits are “Don’t cares.”
10
OS
9
)
8
9-bit
LSB
7
10-bit
LSB
6
11-bit
LSB
TLSB
5
LS byte
12-bit
LSB
Table 8 on
4
CONV
3 2 1
0 0 0
OS
(max).
STDS75
register
LSB
0
0